Given an array of words, along with a target word, count how many times that word appears in the array.
For example:
const words = [
'a',
'chicken',
'salsa',
'a',
'retro',
'salsa',
'retro',
'chicken',
'chicken'
];
const chickenCount = countWord(words, 'chicken');
console.log(chickenCount); // 3